Rotary pump



Feb. 23, 1960 M. PELLADEAU ROTARY PUMP Filed Dec. 21, 1956 FIG. .1.

8 Sheets-Sheet. 1

INVENTOR.

MAME/CE PEL L ADEAU,

BY AM A TTOB/V Y- Feb. 23, 1960 M. PELLADEAU ROTARY PUMP 8 Sheets-Sheet 2 Filed Dec. 21,' 1956 FIG.

Mnue/cs Feb. 23, 1960 M. PELLADEAU ROTARY PUMP 8 Sheets-Sheet. 5

Filed Dec. 21, 1956 FIG. 3.

INVENTOR. MAVBICE PELL 40 E40,

BY 2 W A TTOZ IVE Y.

Feb. 23, 1960 M. PELLADEAU ROTARY PUMP 8 Sheets-Sheet 4 Filed Dec. 21, 1956 FIG. 4

M408 CE Feb. 23, 1960 M. PELLADEAU 2,925,779

ROTARY PUMP Filed Dec. 21, 1956 8 Sheets-Sheet 5 FIG.

15-752 77 78 56 INVENTOR.

Mfll/e/C'E FELL/9054M 147' Toe/vs Y- Feb. 23, 1960 Filed Dec. 21, 1956 M. PELLADEAU ROTARY PUMP FIG.8

I86 202 no 8 Sheets-Sheet 6 ATTORNEY Feb 23, 1960 M. PELLADEAU 2,925,779

ROTARY PUMP Filed Dec. 21 1956 8 Sheets-Sheet 7 FIG. I0

INVENTOR Maurice Pellodeuu ATTORNEY Feb. 23, 1960 Filed Dec. 21, 1956 M. PELLADEAU ROTARY PUMP a Sheets-Sheet 8 INVENTOR Maurice Pellodeuu ZMM ATTORNEY lateral 2,925,779 Patented. .li'ebg.

n mdfi o Patent o 2,925,719 O Y arr Maurice Pell'adeamParis, France, .assignor of one-half to The presentinvention'relates to a rotary pump, and more particularly to a rota'rypump of the movable abutment type wherein a plurality of symmetrically formed pumping chambers are'providedand cooperate with the mov- .able abutments' to produce a uniform pumping action entirely free of pulsations and to give a smooth, constant, continuous and"uninterru'ptedvolume and fiow of fluid from the pump; The invention is a continuation-impart of myapplicat'ion Serial No. 593,982, filed June 26,1956.

'The rotary; pump embodied inthe present invention isformed'with'a plurality of operating chambers which are formed-with suction and "dischargespaces defined by transversely movable abutments. The movable abutment typeo'ff rotary pump is; generally recognized as giving satisfactory performance, but prior to r the instant invention, this typeofpump has not found great favor in industry dueto'the fact lthat it was unduly complicated and was generally uneconomical to'ope'rate for any extensive period. Moreover, the heretofore known rotary Another object of the invention is to provide a-r otary pumpijwhich includes a plurality of symmetrically formed operating chambers defined by adjacently positionedlstationary and rotary members and which cooperate with n are. i a

"ll nother object of the invention is to provide a series of fluid inlet discharge passageways and ports in theistationary members which communicate with the ovable bil qien rfi t a tan vo um mp- 1 operating chambersand which cooperate therewith and with the rotary members to produce the uniform pumpn a eu. J Y

furth r object of the. inventionis to provide a pump which is'forrn ed with counter pressure chambers which are adapted to eompehsate for varying pressures on the Kisse qfie t t n m b Qther objects of the iiivention'are: to provide a pump wherein pressures on thell'ateral surfaces of the rotary membersare maintained in equilibrium to provide a which includesa plurality of operating chambers that areconstantly diminishing andincreasing involume atregu lar intervals, thereby providing for a constant volume delivery, free of pulsations; to. provide a pump wherein the operating chambers for'med therein are fur-i ther defined by regions of tangency between the rotary and "statidfialylmembers, and to provide efi'ective fluid sealswhichl'i mit laterah movement of the moving and s t ar membe s A .l ti p is ts an he n re an advantages of theinstant invention will be apparentfromthe follow-' ing description taken in conjunction. with the accompanying drawings, wherein: 4

Figure 1 is a vertical sectional view of the housing. of the pump, embodied in the present invention, showingthe inner pump elements in elevation. Figure.2 is a view of pump similar to Figure 1 showing the relative position of the pump elements rotary, members havebeen moved Figure 3 is a sectionalview taken along lines 411 Figure 2. l Figure 4 is a partial vertical, sectional view ofthe pump taken along lines 4-4 in Figure 2. Figure-5 is a partial vertical, sectional view taken along lines 5-5 in Figure 2. v Figure dis a sectional view of a rotating member. Figure 7 is a partial elevaticnal view of the rotating member shown in Figure 6; 1 Figure 8 is a vertical, sectional view of amo'dification of the invention, showing the inner pump element elevation.

in Figure 8.

Figure 10 is a sectional view taken along the line Iii- 10 in Figure 8; I Figure 11 is an elevational view of a rotatingme'mber shown in Figure 8. i Figures 12, 13 and 14 represent views showing a'rnodi: fied' form of abutment assembly. I J K Figure 15 is a diagrammatic view showinga linear development of a stationary member and rotary members located adjacent thereto. l i Referring now to the drawings and particularly to, Figures 1 to 3, the pump embodiedin the invention is illustrated therein and is generally indicated at 10. The pump 10 comprises a cylindrical housing 12 which, includ'es an integral end wall 14 having a fluid inlet 16 suitably mounted therein. The opening sideof the housing 12 is closed by an end plate 18 Which is secure cl to the housing 12 by bolts 20 and which has an opening 18" formed therein for receiving a driven shaft 22. As shown more clearly in Figure 3, the driven shaft 22 has an enlarged hub portion 24 integrally formed therewith, the hub portion 24 having an open end central chamber 26. One end of the shaft 22 is journalled for rotation in the end plate 18 and the hub 24 receives in the open end thereof an extension 30 integral with. and protruding from the end wall 14. The extension 30 is formed with a .frustro conical opening 30' which communicates with the fluidinlet pipe 16 and the chamber 26 and the fluid medium is thus adapted to fiow from the inlet pipe into the chamber 26 during the operation of the pump. Positioned in the housing 12 and fixed to thewalls thereof are a plurality of stationary ring members 32, 34' and 36. The end stationary ring member 32 is located adjacent the end wall 14 and is supported against move? ment relativethereto' by one or more bolts 38,. Similarly, the end stationary ring member 36 is located adjacent the end plate 18 and is fixed with respect thereto by one or more bolts 40. The central stationary ring member Figure 9 is a'sectional view taken along the line 34 is secured to the walls of the housing, intermediate the ring members 32 and 36, as seen in Figure 3, by bolts 42, only one of which is shown. The ring members 32 and 36 are both formed with projecting annular flanges 44 and 46, respectively, which form part of the. fluid operating chambers as will herein bev described. The central ring member 34 is formed with oppositely projecting annular flanges 48, 50 which cooperate with the annular flanges 44, 46 to define additional fluid operating chambers, as will hereinafter appear.

Located, in Figure 3 between the stationary ring mem-. bers and secured to the hub 24 by keys 52 and 54 are after assume rotary ring members or rotors 56 and 58. The rotary ring members 56, 58 are identically formed and the configuration thereof is illustrated in Figures 6 and 7. As seen in Figure 6 these rotor members 56, 58 have the. general appearance of a wedge or tapering configuration, but the outer face portions 59 and-60'thereof, are parallel'and are disposed in perpendicular relation with respect to the horizontal. axisof each-member and of the pump. v

The portions between these parallel faces aretapered. As will be described herein, the faces 60 define regions of tangency with the adjacent faces of the. stationary members 52, 58. Formed in'the side. faces of the rotor 56 are oppositely facing annular grooves 61, 62which receive therein the annular flanges 44 and 48, respectively. Similarly, the rotor 58 has the oppositely facing annular grooves 64, 66 formed in the side faces thereof for receiving therein the annular flanges 50 and 46, respectively. As seen in Figure 2, thetapered faces of the rotors, the stationary ring member flanges, the inner faces of the stationary ring members 32 and 36, and bothfaces of the stationary ring member 34, together with the, housing 12, enclose a plurality of operating chambers which are indicated at 68, 70, 72 and 74. The operating chambers are separated by movable contact blades or abutments into suction spaces S1, S2, S3 and S4 and discharge spaces D1, D2, D3 and D4. These abutments or contact blades are arranged in pairs as shown in Figures 1 and 2 and are indicated at 75, 76; 77, 78; 79, 80; and 81,82, and are located in contacting relation with the side faces of the rotors 56, 58. In order to positively urge the contact blades into engaging relation .with the side faces of the rotors, leaf springs 83 are provided and are disposed in suitable grooves or cut out portions formed in the rotor members. i

As shown in Figures 2 and 3, the blades 75, 76 and associated spring 83 are located 'in a notched portion 84 formed inthe stationary ring member 32. The blades 81, 82 and associated spring 83 are located in a similarly formed notched portion 86formed in the stationary ring member 36, and the blades 77, 78 and 79, 80 and associated springs 83 are located in a groove 88 which extends through the stationary ring member 34. The springs 83 positively urge the associated blades into firm contact with the'side faces of the rotor members 56, 58, regardless of the position of said members. Thus, as illustrated in Figure 1, the springs 83 are compressed as the wider portion or face 60 of the wedge or cam channels 106, 108 and 110, which are formed in the walls of the stationary-ring members 32, 34 and 36, respectively. The radial inlet channels 106, 108, 110 extend into short longitudinally running inlet channels 112, 114 and 116 which, in turn, communicate with the operating chambers 68, 70 and 72 and 74, respectively. Since the operating chambers 68 70, 72 and 74 are separated into the suction and discharge spaces by the movable abutments or blades associated therewith, as shown in Figure 2," the inlet channels 112,"..1114, 116"commun1- cate with the suctionspac'es S1,"S2,"*S3a'nd S4," respectively,.and directthe fluid mediumthereto from the central chamber 26. w r 7 Referring. now. to Figure :5, the discharge passage system is illustrated and includes a plurality of short longitudinally extending discharge passages 1'18, 120 and 122 which are formed in the stationary members 32, 34 and 36, respectively, and which communicate with the dischargqspaces D1, D2,.D3 and D4 of the. operating chambers' 68, 70, 72 and 74 respectively. The discharge passages 118, 120 and122 extendinto-short radial=chan nels 12 4, 126 and 128,.-respectively,-which in turn com-, municate with the annular discharge channels 130, 132; and 134m the housing 12. The annular discharge channels130, 132, 134 communicate with a longitudinally ex-, tending discharge passage 136 formedin the-housing 1-2, the discharge passage 13 6 communicating with -a dis-- charge orifice orv port 138. The discharge port 138 may be connected, with any suitable, discharge conduit to direct thefluid mediumto any desired point remote from thepumpwf I It will Ibeapparent that as the,rotor members 56, 58 are interwar. the hub 24, the fluid. medium present will be exhausted from the discharge spacesDI, D2, D3 and D4 of the associated operating chambers into the discharge channe'lsfa'nd thence tothe discharge passage 136.

' By constructing the pump in the mannerdescribed and providing the operatingchanibers 68 ,and 70 onopposite sides of the rotary ring memberfifi and Operating chambers 72 and 74 onoppbsite side's of the rotary ring member58, a balanced fluid system is formed. Thus, the pressure of the motive fluid in the operating chambers g 68 and 70jis'equa1'ang1 lateraltlirustsdue to the pressure shaped rings contacts the faces of the stationary members at a region of tangency. In Figure 2 the region of tangency is shown 'at the point where the face 60 makes contact with the cutout portion or grooves in which the blades 79, 80, 81, and 82 are disposed. In Figure 2 the face portions 59 of the rotor 56 are shown in position opposite the notched portions of the stationary ring members and the blades springs 83 urge the abutments 75, 76am 77, 78 against the side faces 59 of the rotor member 56 and maintain firm contact therewith. Thus, as the rotor members 56 and 58 are rotated, the suction areas S1 to S4 rapidly and uniformly increasein volume whilethe discharge areas D1 to D4 of the operating chambers 68, 70, 72 and 74 rapidly and uniformly decrease in volume to eifect a rapid and uniform pumping action of the fluid medium present, whereby the pumpingaction is free of pulsations and the operation thereof constant.

The fluid medium isinitially introduced into the operating chambers 68, 70, 72, 74 by way of conduit 16 and the hub central chamber 26, and then flows through port 92 into passage (Figure 3) formed in the hub 24; Formed in the wall of the hub 24 and communicating with the passage 90 are ports 94, 96 and 98 which in turn' communicate, respectively, with annular channels 100, 102 and 104. As shownin Figure 4, the annular channels 100, 102, 104 communicate with radial of the fluid are prevented from being'ir'npressed on the side, faces of the rotary member 56. Similarly, the pressure'of the fluid "medium in the operating chambers is balanced'and lateral thrusts on the 'sidefaces'of the rotary member 58 are equalized. I p

In order to obtain a seal between the stationary and rotary members and, in addition, to prevent excessive lateral thrust on the end stationary members, fluid conducting chambers 140 and 142 arelprovided. As shown in Figure 3, the fluidconducting chamber 140is formed between the side face of the stationary member 32 and the inner surface ofthe end wall 14 and communicates with the fluid discharge channels 130, as shown in Figure 5. Similarly, the fluid conducting chamber 142 on the opposite end of the 'pumpi's formed between the inner surface of the end plate 18 and the side face of the stationary member 36 and communicates with the fluid discharge channel 134. I Thus 'the fluid in the pressure chamber is maintained at the pressure of the discharge fluid and therefore balancesith'e thrust exerted on the stationary members by thepressure ofthe fluid in the operating chambers 68 and 72 respectively. Sealing rings 144 and 146 are located in grooves formed .in the end wall14 and end plate 18, respectively, and serve to prevent leakage of the high pressure fluid into the inlet chamber 26. t u

Lubricating means is also provided for the rotating hub 24 and includes a longitudinally extendingpassage 150 formed in the .solid portion of the hub adjacent the j shaft 22. Leading from passage 150 are radial passages assemst v ssi t et to H tionary ring 36and rotary hub' 2.4; The fluid in i t acts as a lubricant. The fluid is returned to the system The'fluid which enters the chamber 142 may also return to the chamber 26 through the passage 150 provided the fluid pressure is sufficient to overcome the forces enerted by the'c'entrifugal action of thepump. The fluid will then return to the chamber 26 by way of passages 92,

i 99, 104, 152.154 and 150. Although the fluid that is normally pumped is hydraulic fluid, which inherently acts to lubricate the pump'elements, it will be clear that other fluids may be pumped through the device which also may act to lubricate the component parts of the pump.

ween the stationary end plate pace 156 tends to cushion the hub 24 and so doing.

by way of the annular channel104 in stationary member one revolution are shown inFigures 1'and2'. Thusin' A similar lubricating system is provided at the other endof the pump adjacent .the extension 30, an annular fluid'passage 158 being formed between the extension 30 and the hub 24. The passage 158 leads into the radial fluid return passage 160, which returns the low pressure fluid to the system by way of annular channel 100. A'

without undue wear while a constant, uniform and uninterrup ted flow of fluid is maintained.

In'operation, referring to Figure 3, the shaft 22 is rotated by a convenient source of power thereby rotating the hub 24 and the rotors 56 and 58 secured thereto.

pipe 16 and extension 30 into the central chamber 26; The fluid then flows through port 92 into the passage 0 and is directed into the annular channels 100, 102 and 104 formed in the stationary members 32, 34, and 36, respectively. s

From these annular channels the fluid is directed through the radial channels 106, 108, and 110, (Figure 4) and then flows into the suction space S1, S2, S3,S4 of the operating chambers 68,70, 72 and 74, respectively, by way of the inlet channels 112, 114- and 116, as shown in Figures 1 and 4. As the rotors 56 and 58 are' rotated-,the parallel faces 60 formed on the wider portion of the wedge shaped members 56, 58 continuously contact the side faces of the adjacent stationary members to form a continuously sliding region of tangency. With the rotors revolving in the direction of the arrows indicated in Figure 1, the suction spaces S1, S2, S3 and S4 which are defined by the regions of tangency' and the spring'loaded contact blades or abutments alternately increase in volume to a maximum, the volume of the suction spaces then dropping instantaneously to 'ze'ro, whereby a rapid pumpingaction free of pulsations is effected. a

As the rotors 56, 58 rotate during the operation of the pump, the fluid is discharged from the discharge spaces D1,' D2, D3 and D4 of the operating chambers'in a continuous and uniform manner." The fluid exhausts from these spaces into the discharge passages 118, 120 and 122 whence it passes into the radial channels 124, 126 and 12S and'discharge channels 130', 132, and 134, in Figure 5. "The dischargedfluid then flows into the common discharge passage 136 and out of the pump through discharge orifice 138.

5 Referring particularly to Figures 1 and 2, the various stages of the rotors 56, 58, are shown and in order to more clearly point out the mode of operation of the rotary pump, 'a single revolution of one of the rotors will be described with reference to the position of both rotors. Since} the rotors are 180 out of phase-all the stages of As the hub rotates fluid is directed through the inlet a Figure 1 considering only the rotor 56", and the operating chamber 68, the suction space S1 is shown in'a diminished position butmoving in an increasing direction.

In Figure 2 the suction space S1 has increased in volume as the narrow parallel face 59 moves into" con: tact with'the abutment blades 75,76. In Figure l the rotor SSrepresents the next position which'the rotor 56 assumes after a total movement of 180. In thispositien the suction space Sl-has further increased' in volume;

while the discharge spaceis diminishing in volume. In Figur'e'Z the rotor 58 represents the last stage of a com: plete revolution of the rotary member and shows the parallel faces 60 in contacting relation with the face of the adjacent stationary member, thereby cutting on the flow of fluid to the suction space and the discharge of fluid from the discharge space. At this point, the delivery from the operating chamber68 is z'ero. Further rotation of the rotors 56, 58 moves them to the position shown in Figure 1 and the cycle is repeated as described;

" Since the operating chamben70 is symmetrical the operating chamber 68, movement of the rotor 68' will force the fluid in the suction space S2 and discharge space D2 through thepurnp" in the manner described above in connection with the operating chamber 68.

. In other words, the movement of the rotor 56 controls the flow of the fluid in the chambers on each side of it. However, since the rotary member 58 is 180 out of phase with the rotary member56, the operating chanrbers 72 and 74- will continue to deliver fluid when the pump delivery of the operating chambers 68, 70 is zerol' Therefore, the pump delivers a constant, uniform, and uninterrupted flow of fluid that isifreefof pulsations.

It will be seen that the spaces 81, S2, S3, and S4, in order to eifectively act as suction chambers, must constantly increase in volume, and conversely the dis charge 'spacesDl, D2, D3, and D4 must constantly decrease in volume to eflectively discharge the fluid medium being pumped. The volume of the suction chambers thus increases progressively to a maximum and then a is instantaneously reduced to zero, thereafter gradually increasing to maximumamount again. The discharge chambers gradually decrease in volume from a maximum to zero and then are instantaneously increased to a maximum amount, whereby the volume is again reduced in a uniform manner. The total volume of the suction chambers S1S4 is always equal to the total volume of the exhaust or discharge chambers D1D4 and this total volume is, of course, constant. In operation, as the rotary members 56, 58 are rotated in the direction of the arrow, as shown in Figure 2, the volume of the discharge chambers D3 and D4 is zero when the parallel faces 60 are tangential to the faces of the adjacent stationary members 34 and 36. The volume of the suction chambers S3 and S4 is then at a maximum; but as soon as the parallel surfaces move beyond the blades 7982, the volume of the suction chambers S3 and S4 is decreased froma maximum amount to zero and the volume of the discharge chambers is increased from a zero to a maximum amount. I i I Referring now to Figure 15, the complementary chambers S2, S3 and D2, D3 are shown in linear development form. Assuming that the member 34 and blades 77 -80 are rotating in the direction of the arrow, it will be clear that the'volume of the suction chambers S2, S3 increases constantly up to a maximum point while the volume of r movement thereof is. substantially prevented. The fluid conducting chambers140and' 142 further define a' fluid seal-forithe pump. and functionrto automatically take up.

any play which may occur in the stationary members. Thus, the pressure of the fluid in the; fluid conducting chambers 140, 142 is. the same as the pressurein the discharge passages 118 and 122 (Figure S), respectively,

and any tendency of the stationary members 32 or 34 tov forpreventing ingress of airor egress of low pressure fluid. Thelow pressure fluid also acts to lubricate the spaces-between the moving and stationary members and is'returned to the system byway of the annular inlet channels 100 and 104.

.amodified' form of the invention, as .,shown in Figures. 8-14, it.,is contemplated to form the stationary. members .32 and. 36 integral with the end wall 14 and the.

end plate 18. In this simplified form of the invention,

the channels and passages 100, 104,106, 110, 112, 11 118, 1 22, 124, 128, 130 and 134 would be eliminated and. communication between the spacesor chambers S1, S2,

and S3, S4 could be effected by forming a series of spaced openings and peripheral passages in the rotary members 56 and 58.

. The peripheral passages would correspond generally to the position of thepassages106, 110, 118, 122 shown in'Figures 1 and 2. Suitable inlet and exhaust passages would thus be formed in rotary and stationary members and the pump wouldoperate as described above, the suction spaces increasing at a uniform rate and the discharge spaces decreasing at a uniform rate to effect a uniform pumping action. p

It will be understood that the pump described herein may be operated at-veryhigh pressures since there are relatively few, moving parts or elements subjected to wear. Moreover, the fluid seals and back pressurechambets are etfective to maintain the high pressures at which the .pump will operate without deforming or seizing and wear will be reduced to a minimum.

. Referring now to Figures 8-10, a modified form of the invention, as mentioned above, is illustrated and includes a cylindrical housing 170 which has an integral end wall 172, having a fluid inlet pipe 174 mounted therein. The open end of the housing 170 receives a flanged endplate 176 which is secured to the housing 170 by bolts 178 and which has a suitably formed opening therein for receiving a-' driven shaft. 180. -As shown more clearly in Figures 8, 9 and 10, the shaft 180 has, an enlarged hubportion 182 in which is formed a central chamber 184. The fluid inletpipe174 communicates with the chamber 184 and is adapted'to supply the operating medium thereto. Centrally positioned in the housing 170 and fixed to the wall thereof by bolts 186 is a stationary ring member 188. On each side of the stationary ring member 188 are rotary ring members 190 and 192 which have a tapered configuration generally similar to the ring members 56, 58, described in connection with Figures l-7. As shown in Figures 9 and 10, the annular grooves formed in the rotary ring members 190, 192 receive annular flanges 170a and 188a, respectively, formed in the casing end walls and in the stationary ring member 188.

The rotary ring members 190, 192 are also formed with flat portions 194,196 which are located in parallel relation with respect to the faces of the stationary ring member 188 and are periodically moved into tangential relation therewith upon rotation of the rotary ringmembers.

'As shown in Figure 8, operating chambers .198 and 204 are formed between the housing end walls and the outer faces of the rotary members 190, 192, while operating chambers 200 and 202 are formed between the inner faces of the rotary members 190, 192 and the lateral faces of the stationary member 1 88. In order to separate the chambers 198-204;into suction, and discharge spaces, movable abutmentsfareprovided and include abutments' 206fand208which extendinto grooves' '210, 212 formed in. the ,endlwalls 172', 176, respectively, and are biased against thev outer faces of the rotary members 190, 192: bycoil springs 214 Abutments 216, 218 are positioned in, a slot 220 formedin the stationary member188 and" are ,biased against the inner faces of the'rotary members,

196, 1 92.by the coil spring 222. Thus, the'movable abutments 206, 208, 216, and 218 separate the chambers 198- 204 into suction spaces .Sa, Sb,Sc and Sd and discharge spaces D a, Db,.Dc andDd. T

The operating medium is introduced into the central chamber. through the inlet pipe 174 and then enters a port 224, Figure 10, formedv in the wall of the hollow portion of theenlarged hub .182, the port 224 communicating with an annular passage 226 which in turn communicates" with a radial passage 228 The operating medium then enters-an inlet passage 230; which communicates directly with the operating chambers 200 and 202. The outer chambers 198 and. 204 do not receive the operating fluid directly, but communicate with the chambers 200 and 202 through-a series of transverse channels 232 and] peripheraL-slots234 formed in the rotary members 190 and 192;- In order to discharge the operating medium from .the operating chambers a discharge passage 236,

Figure 9 ,,.is formed in the stationary member 188, the passage;. 236 communicatingwith the discharge spaces Db and.- Dc. Connected to the discharge passage 236 is a radial passage; 238 which is-tformed in part in the housing and in part. in the stationary member 188. The radial passage 238 is connected to a dischargeconduit 240; and discharge port 242,- these latter all being formed inthe walls of the-housing ,170.

The operation of the device shown in Figures 8-10 is similar to the operation of the device described in connection wtih Figures 1-7 and it will be understood that the operating medium is constantly drawn into the suction spaces Sa, Sb, Sc, Sd through the passage 174 as these spaces increase progressively to a maximum.

At the same time, the fluid medium in the discharge spaces Da, Db, Dc, Dd isdischarged at a constant rate through the discharge passage 236 as these latter spaces progressively decrease in volume. By providing the chan: nels 232 and slots 234 in the body of the rotary members communication between the operating chambers is maintained, but the pump structure is simplified.

Referring now to Figures 12, 13 and 14, a modified form of the abutment members is shown and is illustrated generally at 244. Each abutment member 244 includes a grouping of three elements 246, 248 and 250 which are formed with convex outer edges. One side of the outer edge of each of the elements 246, 248, 250 engages the concave surface of the inner wall of the housing 170, and the other, side of these elements engage the convex outer edge of the housing end walls and stationary member 188. (For a similar arrangement of the abutment, see Figure 3 as described herein.)

As shown in Figure 13, each element 246, 248, 250 is formedwith a transverse slot 252 within which is disposed a cushion 254 of resilient material. The coil spring 256 is mounted on the cushion 254 and bears against the end surface of the grooves formed (210, 212, Figure 8) in the casing end walls or against the side wall of the adjacent abutments if the elements are located in the groove 220 of the stationary ring member, as in Figure 8. The coil spring 256 thus biases the abutment 244 into firm engagement with the lateral faces of the moving or rotary members 190, 192.

At rest, allof the elements 246, 248, 250 of the abutments 244 are in alignment as shown in Figure 12. How: ever, during operation of the device the convex edges ofthe elements are adapetd to shift laterally with respect to each other therebydeforming the resilient cushion 254- As shown in Figure 14, the central element248has. been sinn d towards the outside with res ect to the outer elements 246, 250, the inner edge of the central element 248 making firm contact against the convex inner surface of the adjacent operating chamberand the outer edge of theouter elements 246, 250 making firm contact with the concave outer surface of the operating chamber. Thus,'by allo'wing'the elements to shift laterally as described, .firm engagement of the abutment members against the 'walls of the operating chamber will be'maintained at all times.

It will be o'bvious'to those skilled in this art that various changes maybe made in construction and design without departing .from the spirit of the invention, and therefore the invention is not limited to what is shown in the drawings and described in the specification, but only as indicated in the appended claims.

' I claim:

1. A rotary pump comprising a housing, adrive shaft mounted .for rotation in'said housing, said drive shaft having a hub joined thereto with a chamber formed therein, atleast one stationary member secured in said housing and formed with lateral faces, rotary members secured'to said hub for rotation therewith and positioned in sealing contact with said stationary member so as to provide a pumping action therewith, each of said rotary members having a tapered configuration which defines a maximum and minimum thickness in the axial direction, the portions of .said rotary members defining the maximum and minimum thickness being diametrically opposed, the portion defining the maximum thickness having parallel faces oneof which engages one of the lateral faces of said stationary member to define regions of tangency therewith, the remaining portions of said rotary members being spaced from the lateral faces of said stationary members to define working chambers therewith, abutments disposed in said stationary member and contacting the lateral faces of saidrotary members, means for urging said abutments into contacting relation withl said lateral faces .for separating said working chambers into suction and discharge spaces, inlet means formed in said stationary members and communicating with said suction spaces, discharge means formed in said housing and communicating with said discharge spaces, passage means communicating with the chamber in said shaft and with said inlet means for introducing fluid \into said suction spaces, and 'flui'cl discharge passages formed in said stationary members and communicating with said discharge means for exhausting the fluidfrom said housing, relative rotation between said rotary members and stationary member causing said abutments to reciprocate while maintaining contact with the side faces of said rotary members, the volume of said discharge spaces being reduced uniformly from a maximum to a minim-um and the volume of said suction spaces being increased from :a minimum to a maximum whereby auniform pumping action is effected, the sum of the volumes of the fluid being discharged and received remaining constant.

2. A rotary pump as set forth in claim 1, said urging meansincluding springs secured to said stationarymemher and engaging said abutments for urging said abutments into contacting relation with the lateral faces of said rotary members.

3. A rotary pump as set forth in claim 1, which includes a plurality of stationary members similar to said first named stationary member and located in alternate relation with respect to said rotary members, sealing means disposed between said stationary members and rotary members, said sealing means being defined by sealing chambers located between said housing and adjacent stationary members, said sealing chambers communicating with said discharge means and receiving low pressure fluid therefrom, said fluid filled sealing chambers limiting axial movement of said stationary members and said rotary members.

5. A rotary machine as set forth in claim 1, said abuta 10 ments iincludin'g ca plurality of elements having a transverse groove formed therein, a'cushion'disposed in said groove, said cushion providing for relative movement of said elements .upon contact of the edges of said elements with the surfaces of said working chambers.

5. -In a rotary machine as set forth inclaim .1,jsaid rotaryimembers being profv'ided with passages in thebody thereof, said passages. providing for communication "between adjacent working chambers.

'6. In a rotary machine for pumping a fluid medium, the combination comprisinga housing, a shaftjourn'alled for rotation in said housing and having a central 'hnb joined thereto, said hub being formed with a-chamb'er forreceiving thefiuid medium therein, a plurality of stationary members fixed to said housing "and formed with lateral faces, a plurality offrotary'membersfixed to said hub for rotation therewith and positioned between a stationary member, each of said rotary'members having a tapered configuration which defines "a maximum and minimum thickness in the axial direction, the portions of said rotary members defining the maximum and "minimum thickness'being diametrically opposed, the portion defining the maximum "thickness having parallel "faces one of which engages one of the lateral faces of said stationary member to define regions of tangency therewith, the remaining .portions of said rotary members being spaced from the lateral faces of said stationary member to define working chambers therewith, longitudinally movable abutments positioned in each of said stationary members and engaging said rotary members to divide said working chambers into suction and discharge spaces, means for urging said 'abutments into engaging relation withsaidrotary members, inlet passages formed in said stationary members and communicating with said suction spaces, discharge means formed in'said housing and .communicatingwith said discharge spaces, passage means communicating with said chamber in said hub and said inlet passages for directing said fluid into said suction spaces, and passage means formed in said stationary members and communicating with said'discharge means for receiving said fluid "from said discharge spaces, rotation of said rotary members causing said suction and discharge spaces to increase and decrease in volume respectively and thereby effect a uniform'purnping action.

7. A rotary pump comprising a housing, a pair of stationary members, 'each of which is fixed to an end walltof said housing, and a thirdstationary member fixed itolsaid housing intermediate said'pair of stationary members, said stationary members being formed with lateral faces, a pair of rotary members, one of said pair of rotary members being positioned between said third statijonarymember and one of said first named stationary members, said rotary members being tapered to'define 'a maximum and minimum thickness in the axial direction, the portions of said rotary members defining the maximum and minimum thickness being diametrically opposed, the portion defining the maximum thickness having parallel faces one of which engages 'one of the lateral faces of said stationary member to define regions off tangency therewith, the remaining portions of said rotarymembersbeing spaced from the lateral faces of said stationary member to define working chambers therewith, movable members positioned in said stationary members, means for urging said movable members into contacting relation with said rotary members, each of said working chambers thereby being divided in suction and discharge spaces that increase and decrease in volume respectively upon rotation of said rotary members, means communicating with said suction spaces for introducing operating fluid therein, passage means formed in said stationary members for exhausting said operating fluid from said discharge spaces, and fluid conducting chambers formed between the end walls of said housing and the lateral wall of the adjacent stationary member, said fluid conducting chambers receiving fluid therein under pressure, thereby providing for limited lateralmovement of said stationary members and preventingwear thereof during high pressure operation of said pump.-

8. In a rotary-pump as set forth in claim 7, said fluid introducing means including a rotatable hub fixed to said rotary members and having a centralinlet chamber formed therein, and passage means formed in said stationary members and communicating with said inlet chamber in the hub and 'said working chamber for directing fluid from said inlet chamber into said suction spaces.

9. A. rotary pump comprising a housing, a plurality of stationary members disposed in said housing and having lateralfaces formed thereon, at least one rotary member positioned between said stationary members, said rotary member having a tapered configuration which defines a maximum and minimum thickness in the axial direction, theportions of said rotary member defining the maximum and minimum thickness being diametrically opposed, theportion defining the maximum thickness having parallel faces one of which engages one ofthe lateral faces of said stationary member to ,define regions of tangency therewith, theremaining portions of said rotary member being spaced from the lateral faces of said stationary members to define working chambers therewith, abutment means disposed in said stationary members and contacting a lateral surface of a rotary member, said abutment means dividing said working chambers into suction and discharge areas, means communicating with saidsuction areas for introducing operating fluid thereto, said fluid introducing means including passage means formed in said stationary members and a rotatable hub. fixed to said rotary member and having a central inlet chamber, means communicating with said discharge areas for exhausting said operating fluid therefrom, said fluid discharging means including passages formed in said stationary members, said suction and discharge .areas increasing and decreasing in volume respectively as said rotary member is rotated to effect a rapid pumping action, and means for minimizing wear in said pump, said last named means including chambers formed between the housing end walls and the lateral surfaces of the adjacent stationary members, said chambers receivinghigh pressure fluid therein for allowing limited axial movement of said stationary members, thereby reducing the wear thereof when said pump is operating at high pressures. r v

10. In a rotary machine'for pumping a fluid medium, a stationary member fixed in said housing, a plurality of rotary members disposed in said housing and arranged posed in said stationary member and contacting the side faces of said rotary members, thereby dividing said working chambers into suction and discharge spaces, means communicating with said suction spaces for introducing said fluid medium thereto, said fluid introducing means including a rotatable hub secured to said rotary members and having an inlet chamber formed therein and passage means formed in said stationary members and communicating with said inlet chamber and said suction spaces, and discharge means communicating with said discharge spaces for exhausting said fluid medium therefrom, said discharge means including passage means formed in said stationary members, said suction and discharge spaces increasing and decreasing in volume, respectively, upon rotation of said rotary members, whereupon a constant volume pumping action is effected.

11. A rotary pump comprising a housing, at least one stationary member secured in said housing and being formed with lateral faces thereon, rotary members positioned in said housing in alternate relation with respect to said stationary member, said rotary members having in alternate relation withrespect to said'stationary mernber, each of said rotary members having a tapered configuration which defines a maximum and minimum thickness in the axial direction, the portions of said rotary members defining the maximum and minimum thickness being diametrically opposed, the portion defining the thickness having parallel faces' one of which ing chambers therewith, axially movable abutments disa tapered configuration which defines a maximum and minimum thickness in theaxial direction, the portions of said rotary members defining the maximum and minimum thickness being diametrically opposed, the portion defining the maximum thickness having parallel faces one of which engages meet the lateral faces of said statlonary member to define regions of tangency therewith, the remaining portions of said rotary members being spaced from the lateral faces of said stationary member to define working chambers therewith, abutments disposed in said stationary member and contacting the lateral facesof said rotary members, means for urging said abutments into contacting relation with said lateral faces for separating said working chambers in suction and discharge spaces, said rotary members being formed with passages in the body thereof which provide for communication between adjacent working chambers, means communicating with said suction spaces for introducing operating fluid therein and passage means formed in said stationary member and communicating with said dis- ;harge spaces for exhausting said operating fluid thererom.

References Cited in the'file of this patent UNITED STATES PATENTS 1,238,501 Ernst Aug. 28, 1917 1,460,988 Thompson July 3, 1923 1,825,571 Barreaux et al. Sept. 29, 1931 1,936,467 Deubel -a Nov. 21, 1933 2,070,606 Lickfeldt Feb. 16, 1937 2,112,770 Gleason Mar. 29, 1938 2,142,867 Deubel Jan. 3, 1939 2,521,592 McManus Sept. 5, 1950 2,583,633 Cronin Jan. 29, 1952 2,628,566 Berner et al Feb. 17, 1953 2,672,099 'Deubel Mar. 16, 1954 FOREIGN PATENTS 639,541 Germ-any Dec. 9, 1936 658,304 Great Britain Oct. 3, 1951 

